JP3071183B2 - DSRC vehicle-mounted device and DSRC device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intelligent transport system (Intelligent Transport System).
Systems (hereinafter, abbreviated as “ITS”) (Dedicated Short)
-Range Communication)
The present invention relates to a vehicle-mounted device of a system, and particularly to a vehicle-mounted device in which a receiving circuit is automatically activated only when necessary to reduce power consumption, and a DSRC using the same.
It concerns the device.

[0002]

2. Description of the Related Art In general, in a DSRC vehicle-mounted device used for ITS, a receiving circuit is always provided during traveling of a vehicle so that a short-range communication can be immediately performed when a communication request is generated with a roadside device. Has been started.

FIG. 6 is a block diagram schematically showing a conventional DSRC vehicle-mounted device and its peripheral configuration. In FIG. 6, the on-board DSRC device 1 activates a receiving circuit 3 and a transmitting circuit (not shown) for performing short-range communication with the on-road unit 2 installed on the traveling road of the vehicle, and the receiving circuit 3. And a receiving circuit starting means 4 for performing the operation.

The receiving circuit starting means 4 in the onboard DSRC device 1
Is connected to the battery 6 via the ignition switch 5, and when the ignition switch 5 is turned on, the receiving circuit 3 is activated by power supply from the battery 6 mounted on the vehicle.

In this case, the receiving circuit starting means 4 is always driven by the battery 6 to supply power to the receiving circuit 3 when the ignition switch 5 is turned on.

FIG. 7 is a block diagram showing another conventional example. In FIG. 7, the receiving circuit starting means 4 in the vehicle-mounted DSRC device 1 is provided with a different D from the ignition battery 6.
It is directly connected to the battery 6A built in the SRC vehicle-mounted device 1.

As is well known, the battery 6A can be constituted by a built-in battery, a dry battery, a solar cell system, or the like. In this case, the receiving circuit starting means 4 is configured to continuously supply power to the receiving circuit 3 after being connected to the battery 6A.

As is well known, a transmission circuit (not shown) in the DSRC vehicle-mounted device 1 is supplied with power only when a transmission request is generated.

[0009]

As described above, when the conventional DSRC vehicle-mounted device is supplied with power from the vehicle-mounted battery 6 as shown in FIG. However, since the power is continuously supplied to the receiving circuit 3, there is a problem that the receiving circuit 3 and the receiving circuit starting means 4 generate heat.

[0010] In particular, since the onboard DSRC device is mounted near the dashboard in the vehicle cabin, it is subject to a temperature rise due to solar radiation, and is generally in a severe temperature environment exceeding 100 ° C. Means 4
Self-heating is a major problem.

As shown in FIG. 7, when power is directly supplied from the battery 6A in the vehicle-mounted DSRC device 1, when the vehicle is left unattended or when the vehicle-mounted DSRC device 1 is carried, the receiving circuit 3
Since power is continuously supplied even when power supply to the battery 6A is not required at all, there is a problem that the life of the battery 6A is shortened due to continuous consumption of current consumption.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a DSRC vehicle-mounted device in which a receiving circuit is automatically activated only when necessary to reduce power consumption, and a DSRC device using the same. The purpose is to obtain.

[0013]

According to a first aspect of the present invention, there is provided a DSRC vehicle-mounted device for performing short-range communication with a road-side device installed on a traveling path of a vehicle. Receiving circuit activated by the power supply of
Receiving circuit starting means for starting the receiving circuit, comprising a starting condition determining means for determining a starting condition of the receiving circuit starting means, the starting condition determining means, vibration information detecting means for detecting vibration information of the vehicle, A vibration information determining means for comparing the vibration information of the vehicle with a reference value, wherein the receiving circuit outputs a determination signal for activating the receiving circuit when the vibration information satisfies a predetermined condition corresponding to a starting condition with respect to the reference value. This is output to the starting means.

A DSRC according to a second aspect of the present invention.
The vehicle-mounted device according to claim 1, wherein the vibration information is a vibration level, the reference value corresponds to a vibration level of the vehicle under a predetermined traveling condition, and the activation condition determination means determines that the vibration level is equal to or more than the reference value. If it indicates, a determination signal is output.

A DSRC according to claim 3 of the present invention.
The vehicle-mounted device according to claim 1, wherein the vibration information is a vibration frequency, the reference value corresponds to a vibration frequency band in a predetermined traveling condition of the vehicle, and the activation condition determination unit determines that the vibration frequency is the reference value. If it indicates, a determination signal is output.

Further, a DSRC according to claim 4 of the present invention.
The vehicle-mounted device according to claim 1, wherein the vibration information is a vibration level and a vibration frequency, and the reference value is a first reference value corresponding to the vibration level of the vehicle under a predetermined traveling condition and a predetermined reference value of the vehicle. And a second reference value corresponding to the vibration frequency band of (i), and the activation condition determining means generates a determination signal when the vibration level indicates the first reference value or more and the vibration frequency indicates the second reference value. Output.

Further, a DSRC according to claim 5 of the present invention.
The vehicle-mounted device according to claim 1, wherein the vibration information is a vibration level and a vibration frequency, and the reference value is a first reference value corresponding to the vibration level of the vehicle under a predetermined traveling condition and a predetermined reference value of the vehicle. And a second reference value corresponding to the vibration frequency band of (i), and the activation condition determination means determines when the vibration level indicates the first reference value or more, or when the vibration frequency indicates the second reference value. It outputs a signal.

Further, a DSRC according to claim 6 of the present invention.
The vehicle-mounted device according to any one of claims 1 to 5, wherein the activation condition determination means includes a filter means for performing a filtering process on the vibration information, and compares the vibration information after the filtering with a reference value. It is.

A DSRC according to claim 7 of the present invention.
The vehicle-mounted device according to any one of claims 1 to 6, wherein the activation condition determination means includes an external input switch, and the reference value is responsive to an operation signal output from the external input switch when the external input switch is operated. Is variably set.

Further, a DSRC according to claim 8 of the present invention.
In the vehicle-mounted device, the reference value is switched and set in a plurality of stages by an operation signal.

A DSRC according to a ninth aspect of the present invention.
In the vehicle-mounted device, the reference value is updated and set based on vibration information detected when the external input switch is operated.

A DSR according to claim 10 of the present invention.
The vehicle-mounted device according to any one of claims 1 to 9, wherein the activation condition determination means includes a vehicle speed sensor for detecting a vehicle speed of the vehicle, and the reference value is variably set according to the vehicle speed. It is.

The DSR according to claim 11 of the present invention.
The vehicle-mounted device according to any one of claims 1 to 10, wherein the activation condition determining means includes a memory means for storing vibration information over a predetermined period, and a communication means for generating a communication end signal when communication with the on-road device ends. End signal generating means; and, in response to the communication end signal, read from the memory means vibration information immediately before the start of communication with the on-road device, calculate and set a reference value, and include reference value setting means for storing the reference value. It is a thing.

A DSR according to claim 12 of the present invention.
The C device may be any one of claims 1 to 11
In addition to using the on-board SRC device, the vehicle includes a plurality of uneven portions having a predetermined interval and a predetermined width laid in a predetermined area of a traveling path of the vehicle. A determination signal is output in response to the result.

A DSR according to claim 13 of the present invention.
In the device C, in claim 12, the concave-convex portion is provided immediately before a communication area for a road device communicated with a receiving circuit.

A DSR according to claim 14 of the present invention.
The C device according to claim 12 or claim 13, wherein the uneven portion is provided immediately before the curve area of the traveling road.

The DSR according to claim 15 of the present invention.
In the C apparatus according to the twelfth or thirteenth aspect, the uneven portion is provided immediately before the dozing warning area on the traveling path.

Also, the DSR according to claim 16 of the present invention.
The C apparatus according to any one of claims 12 to 15, wherein the interval and the width of the uneven portion are set to different values according to different regions of the traveling path.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a vehicle-mounted DSRC device according to a first embodiment of the present invention.

The arrangement of the on-road unit 2, the receiving circuit 3, and the battery 6A, which are not shown in FIG. 1, is as shown in FIG. Here, the battery 6A built in the DSRC vehicle-mounted device is used, but the vehicle-mounted battery 6 via the ignition switch 5 may be used.

In FIG. 1, the on-board DSRC device has a receiving circuit 3 and a receiving circuit starting means 4 similar to those described above.
A start condition judging unit for judging start conditions of the receiving circuit start unit is provided.

As will be described later, the start condition judging means 10 judges judgment signals Db and D for starting the receiving circuit 3 when the vibration information satisfies a predetermined condition corresponding to the start condition.
f is output to the receiving circuit starting means 4.

The starting condition determining means 10 includes a vibration sensor 11 for detecting a vibration A of the vehicle, a vibration level detecting means 12 for detecting a vibration level B from the vibration A, and a reference value for setting a reference value Cb of the vibration level B. The apparatus includes a setting unit 13 and a vibration level determination unit 14 that compares the vibration level B with a reference value Cb and outputs a determination signal Db when the activation condition is satisfied.

The starting condition determining means 10 includes a vibration frequency detecting means 15 for detecting the vibration frequency F from the vibration A in response to the determination signal Db, and a reference value setting means 16 for setting a reference value Cf of the vibration frequency F. And the vibration frequency F to the reference value C
and a vibration frequency determining unit 17 that outputs a determination signal Df when the activation condition is satisfied as compared with the frequency f.

The vibration level detecting means 12 and the vibration frequency detecting means 15 constitute a vibration information detecting means, and respectively detect a vibration level B and a vibration frequency F as vibration information of the vehicle.

The reference values Cb and Cf set by the reference value setting means 13 and 16 respectively correspond to a vibration level and a vibration frequency band under predetermined running conditions (starting conditions) of the vehicle.

The vibration level determining means 14 and the vibration frequency determining means 17 use the vehicle vibration information as reference values Cb and Cb.
f, the vibration level determination means 14 outputs a determination signal Db when the vibration level B is equal to or higher than the reference value Cb, and the vibration frequency determination means 17 Indicates a reference value Cf, a determination signal Df is output.

Here, the vibration level determining means 14 and the vibration frequency determining means 17 are connected in series, and the starting condition determining means 10 determines that the vibration level B is equal to or higher than the reference value Cb and the vibration frequency F is equal to the reference value Cf. In such a case, a final determination signal Df is output.

Further, only the determination signal Df is used for starting the receiving circuit 3, and the determination signal Db can be used for auxiliary determination of, for example, failure of the vibration frequency detection system.
Note that both the determination signals Db and Df may be treated equally, and the receiving circuit 3 may be activated when either the vibration level B or the vibration frequency F satisfies the activation condition.

Further, the starting condition determination means 10 includes an external input switch 18 operated by a driver or the like, a vehicle speed sensor 19 for detecting the vehicle speed Vs, and vibration information (vibration level B and vibration level) over a predetermined period. Frequency F)
And a communication end signal generating means 21 for generating a communication end signal E when communication with the roadside device 2 (see FIG. 6) is ended.

The external input switch 18 generates an operation signal G by a driver's operation. The operation signal G is input to the reference value setting means 13 and 16, and the reference values Cb and C
f is variably set.

Here, the operation signal G acts as a trigger signal for updating the reference value, and the reference value setting means 13 and 1
In 4, the vibration information (vibration level B and vibration frequency F) detected when the external input switch 18 is operated is updated and set as new reference values Cb and Cf.

The operation signal G from the external input switch 18 can be used to adjust the reference values Cb and Cf in a plurality of stages in order to correct the difference between the vibration information B and F depending on the vehicle type.

The external input switch 18 is composed of, for example, a numeric keypad, and the reference values Cb and Cf can be directly rewritten manually by an operation signal G acting as a data value.

On the other hand, the vehicle speed Vs detected by the vehicle speed sensor 19 is inputted to the reference value setting means 13 and 16. Therefore, the reference value setting means 13 and 16
The reference values Cb and Cf can be variably set according to the vehicle speed Vs.

Further, reference value setting means 13 and 16
Has a calculation unit and a storage unit (not shown) that operate in response to the communication end signal E. Therefore, the reference value setting means 13 and 16 respond to the communication end signal E,
Vibration information (vibration level Bm) immediately before the start of communication with the roadside device 2
And the vibration frequency Fm) are read out from the memory means 20, and the reference values Cb and Cf are calculated and set, and the calculated reference values Cb and Cf can be stored.

Next, the operation of the first embodiment of the present invention shown in FIG. 1 will be described. First, while the vehicle is running, the vibration sensor 11 detects the vibration A of the vehicle and the vehicle-mounted DSRC device, and the vibration level detecting means 12 detects the magnitude of the vibration A as the vibration level B.

Next, the vibration level judging means 14 compares the vibration level B with the reference value Cb, and compares the vibration level B with the reference value Cb.
If the value indicates b or more, it is determined that the activation condition is satisfied, and the determination signal Db is output.

Subsequently, the vibration frequency detecting means 15 detects the vibration frequency F, and the vibration frequency judging means 17 compares the vibration frequency F with a reference value Cf.
When f is indicated, the determination signal Df is output assuming that the activation condition is satisfied.

The determination signal Df activates the receiving circuit starting means 4, whereby the receiving circuit 3 is supplied with power from the battery 6A (or the battery 6 via the ignition switch 5). At this time, the reference values Cb and Cf that determine the activation condition of the receiving circuit 3 are variably set as follows according to various conditions.

That is, the reference values Cb and Cf are variably set according to the driver's intention by the external input switch 18 operated by the driver.

For example, during steady operation on a stable traveling road,
By operating the external input switch 18 to generate the operation signal G, vibration information during steady operation is input to the reference value setting means 13 and 16.
And 16 can set appropriate reference values Cb and Cf using this vibration information as a background level.

In general, during normal running of a vehicle, the vibration level B for a certain vehicle speed is substantially determined according to the type of the vehicle, for example, when the vehicle is running on a paved road at a constant speed.

Therefore, the driver operates the external input switch 18 when driving on a normal paved road with little unevenness at a constant vehicle speed of about 60 km / h, and operates as a reference value setting command for vibration detection. A signal G is generated.

The reference value setting means 13 and 16 determine the vehicle speed Vs and the vibration information B and F when the operation signal G is input.
Based on the vibration information B and F during normal running of the vehicle.
Is stored.

The reference value setting means 13 and 16
Vibration information B during normal running when operation signal G is input
And F, the vibration information in front of the communication area where the roadside device 2 is installed is estimated, and the reference values Cb and Cf capable of reliably detecting the vibration information in front of the communication area are calculated and set.

The vibration information B and F before the communication area are
If the road surface condition is determined, it is determined according to the vehicle type, so that the reference values Cb and Cf for detecting the unique vibration information B and F in front of the communication area are automatically set.

The reference value setting means 13 and 16
When the vehicle speed Vs indicates normal driving, the reference values Cb and Cf are automatically and variably set based on the vibration level B and the vibration frequency F during normal driving.

Further, reference value setting means 13 and 16
Captures vibration information (vibration level Bm and vibration frequency Fm) detected immediately before the start of communication from the memory means 20 when communication is actually performed with the on-road unit 2, and reads the vibration information Bm, The reference values Cb and Cf are automatically calculated based on Fm and the vehicle speed Vs, and the calculation results are stored as updated reference values Cb and Cf.

That is, the reference value setting means 13 and 16
Predicts and calculates the reference values Cb and Cf from the vehicle speed Vs, the vibration level Bm, and the vibration frequency Fm on the road in front of the communication area where the on-road unit 2 is installed.

Therefore, the vibration level judging means 14 and the vibration frequency judging means 17 calculate the reference value C
Based on b and Cf, a comparison is made between the vibration level B and the vibration frequency F detected next time, and the receiving circuit 3 is activated when the above-described activation condition is satisfied.

As described above, the receiving circuit 3 and the receiving circuit starting means 4 are in a state where the main power supply is turned off during the normal running and are started only when the determination signal Df is generated. Power consumption can be reduced, and heat generation of the onboard DSRC device and wasteful consumption of the battery 6A can be prevented.

Further, even when the vehicle is parked or stopped, the power supply of the receiving circuit 3 is cut off to prevent wasteful power consumption of the battery 6A, so that the consumption of the battery 6A is suppressed and the life of the battery 6A is reduced. Can be extended.

Since the reference values Cb and Cf are variably set in response to the operation signal G, the vehicle speed Vs, and the communication end signal E, vibration information (vibration level B and vibration frequency F) due to a difference in vehicle type and the like is obtained. The reference values Cb and Cf can be corrected so as to cancel the variation.

That is, by setting the reference values Cb and Cf based on the vibration information during normal traveling, it is possible to prevent the receiving circuit 3 from being erroneously activated in the communication unnecessary area, and to surely set the receiving circuit 3 in front of the communication area. Can be activated.

Further, since the reference values Cb and Cf are updated and set with high accuracy based on the vibration information during actual running, it is possible to more reliably prevent the receiving circuit 3 from being erroneously activated due to vibration during normal running. Can be.

Further, since not only the vibration level B but also the vibration frequency F is detected as the vibration information, only the natural vibration in front of the communication area can be detected with high accuracy, and the communication area requiring activation is required. Receiving circuit 3 just before
Can be started reliably.

Since the reference values Cb and Cf for comparison and determination are determined based on the actually measured vibration information, it is possible to reliably cope with a temporal change of the vibration information due to deterioration of the vehicle. The receiving circuit 3 can be activated just before the communication area.

Further, in response to the communication end signal E, the reference values Cb and Cf are corrected on the basis of the actual vibration level B and the vibration frequency F detected before the communication area, so that the communication area can be accurately detected. And the receiving circuit can be activated only when necessary.

Embodiment 2 In the first embodiment, both the vibration level B and the vibration frequency F are used as the vibration information, but only one of them may be used.

For example, when only the vibration level B is used, attention is paid to the engine rotation state that differs depending on the vehicle type.
By variably setting the reference value Cb based on the engine vibration level, it is possible to reliably set the optimum reference value Cb according to the vehicle type.

When attention is paid to the vibration frequency F due to the rotation of the engine, the vibration sensor 11 detects the vibration frequency F at the time of starting the engine, and when the vehicle is in a drivable state, the power supply of the receiving circuit 3 is started. Can also be

Generally, the vibration frequency F of a four-cylinder engine
Is obtained as in the following equation (1) using the engine speed Ne [rpm].

F = Ne × 4 [cylinder] / (60 [sec] × 2 [rotation]) (1)

Based on the equation (1), the reference value Cf of the vibration frequency F is set so as to be slightly lower than the idling frequency. Thereby, the receiving circuit 3
It is activated when a vibration frequency F equal to or higher than the reference value Cf is detected.

Embodiment 3 In the first embodiment, the reference value setting means 13 and 16 respond to the operation signal G from the external input switch 18 to fetch the background level vibration information and variably set the reference values Cb and Cf. However, a plurality of reference values stored in advance in each of the reference value setting means 13 and 16 may be switched and set in response to the operation signal G.

In this case, the driver manually generates the operation signal G a predetermined number of times according to the vehicle type in order to compensate for the difference in the vibration information due to the vehicle, thereby changing the reference values Cb and Cf from the known values. It can be selected and switched and adjusted in a plurality of stages.

For example, when attention is paid to the vibration level B,
The reference value Cb is set to a relatively low value for a high-end vehicle with low vehicle vibration, and the reference value Cb is set to a relatively high value for a light four-wheeled vehicle with relatively high vehicle vibration.

The reference value Cb of the vibration level B varies not only between a luxury car and a mini car, but also between a gasoline car and a diesel car. It is manually adjusted in multiple stages accordingly. This eliminates the need for calculating the reference values Cb and Cf, thereby simplifying the processing of the reference value setting means 13 and 16.

Embodiment 4 In the first embodiment, the vibration level B and the vibration frequency F are directly input to the determination units 13 and 17.
A filter means (not shown) may be inserted between 2 and 15 and each of the determination means 13 and 17 to compare and determine the vibration information B and F after filtering with the reference values Cb and Cf.

In this case, since the noise component included in the vibration information is removed by the filtering process, the starting condition can be determined with high reliability based on the vibration information in which the influence of the noise component is suppressed. Erroneous activation of the circuit 3 can be more reliably prevented.

Embodiment 5 In the first embodiment, the determination means 14 and 17 generate the determination signals Db and Df digitally processed with respect to the reference values Cb and Cf, and determine the establishment of the start condition. The vibration information B and F consisting of values may be used as they are.

Embodiment 6 FIG. In the first embodiment, the determination means 14 for the vibration level B and the vibration frequency F
Are arranged in series with each other, and the activation condition is satisfied when both of the determination signals Db and Df are generated. However, the determination units 14 and 17 are arranged in parallel, and the determination signals Db and Df are determined. The start condition may be satisfied in any one of the cases.

FIG. 2 is a block diagram showing Embodiment 6 of the present invention, and has the same configuration as that of FIG. 1 except that judging means 14 and 17 are arranged in parallel. In this case, in response to the determination signal Db or Df indicating the establishment of at least one of the vibration level B and the vibration frequency F, the receiving circuit starting means 4 starts to start the receiving circuit 3.

Therefore, even if one of the detection systems of the vibration level B and the vibration frequency F goes down, the receiving circuit 3 can be activated by the judgment signal from the other detection system.

Embodiment 7 In the first embodiment, only the vibration information processing in the on-board DSRC device has been described without particularly considering the conditions of the traveling road. However, the vibration information in the predetermined area is detected with high reliability and reliably received. In order to activate the circuit, an uneven portion having a predetermined interval and a predetermined width may be laid in relation to a predetermined region on the traveling road side.

FIG. 3 shows a DS according to the seventh embodiment of the present invention.
FIG. 2 is a plan view illustrating a traveling path related to the RC device, and illustrates a case where a communication area is targeted as a predetermined area on the traveling path. The configuration of the vibration information detecting means and the starting condition determining means in the vehicle 30 is the same as that described above (see FIG. 1 or FIG. 2).

In FIG. 3, the vehicle 3 traveling in the direction of the arrow
In front of 0, there is a communication area 31A where the on-road unit 2 is installed. A plurality of uneven portions 32A having a fixed interval Pa and a width Qa are laid on the traveling path 31 immediately before the communication area 31A.

As shown in FIG. 3, when the vehicle 30 passes over the uneven portion 32A provided on the traveling path 31, vibration corresponding to the uneven portion 32A is generated in the vehicle 30, and the vibration is attached to the vehicle 30. It is detected by the vibration sensor 11.

Hereinafter, similarly to the above, the activation condition determining means 1
0 is the vibration level B equal to or higher than the reference value Cb or the reference value Cf
When the vibration frequency F is detected, the power supply of the receiving circuit 3 is started.

At this time, if the interval Pa and the width Qa of the uneven portion 32A are known, the vibration frequency F of the uneven portion 32A is determined as an accurate eigenvalue from the vehicle speed Vs. It can be determined with high accuracy that the vehicle is traveling before the area 31A.

Therefore, the starting condition determining means 10 responds to the comparison result between the reference values Cb and Cf corresponding to the concave and convex portions 32A and the vibration information B and F with a highly accurate determination signal D.
b and Df are output, and the receiving circuit 3 can be reliably started.

Further, the activation of the receiving circuit 3 causes the DSRC
When communication is actually performed between the on-board unit and the on-road unit 2,
In response to the communication end signal E, the reference value setting means 13 and 16 respond to the communication end signal E in response to the vibration level B, the vibration frequency F and the vehicle speed V detected while traveling immediately before the communication area 31A.
From s, it is possible to recognize the actual vibration information by the uneven portion 32A.

Therefore, the reference value setting means 13 and 1
No. 6 can automatically update and store the optimum reference values Cb and Cf based on the actually measured value of the vibration information corresponding to the uneven portion 32A.

At this time, the reference value C for the vibration level B
b is set as a comparison value for vibration detection, and the reference value Cf for the vibration frequency F is set as a natural frequency before the communication area 31A.

Embodiment 8 FIG. In the above-described seventh embodiment, the case where the uneven portion 32A is laid only immediately before the communication area 31A has been described. However, the uneven portion can be laid immediately before another area.

FIG. 4 shows a DS according to the eighth embodiment of the present invention.
FIG. 3 is a plan view showing a traveling path related to the RC device, and shows a case where a curved area is targeted as a predetermined area on the traveling path.

In FIG. 4, a curved area 31B exists in front of a traveling path 31 of a vehicle 30, and a plurality of sections having a constant interval Pb and a width Qb are provided on the traveling path 31 immediately before the curved area 31B. Is provided.

In this case, the interval Pb and the width Qb of the uneven portion 32B are set to values larger than the interval Pa and the width Qa of the uneven portion 32A related to the communication area 31A (see FIG. 3).

On the other hand, the starting condition determining means 10 in the vehicle 30
The vibration frequency F inherent to the uneven portion 32B in front of the curve area 31B is controlled by the operation of the external input switch 18 or the like.
, The detection function can be arbitrarily switched. Further, it is assumed that the vehicle 30 is provided with a notifying unit (not shown) such as a sound or a buzzer.

As shown in FIG. 4, by laying the uneven portion 32B having the specific interval Pb and the width Qb immediately before the curve region 31B, the starting condition determining means 10 allows the start condition judging means 10 to generate the curve region 31B based on the vibration frequency F. It can be determined that the vehicle is traveling in front.

Therefore, by using the vibration frequency detecting function of the starting condition determining means 10, when the vehicle 30 approaches the curve area 31B, the notifying means is driven in response to the determination signal Df, and the approach of the curve area 31B is performed. The state can be notified to the driver in advance.

Embodiment 9 FIG. In the eighth embodiment, the uneven portion 32B is laid immediately before the curved region 31B. However, for example, the uneven portion may be laid immediately before the dozing warning region. FIG. 5 shows a DSR according to a ninth embodiment of the present invention.
FIG. 4 is a plan view illustrating a traveling path related to the C apparatus, and illustrates a case where a dozing warning area is targeted as a predetermined area on the traveling path.

In FIG. 5, a drowsiness warning area 31C exists in front of the traveling path 31 of the vehicle 30. On the traveling path 31 immediately before the drowsiness warning area 31C, a fixed interval Pc and a width Qc are provided. A plurality of uneven portions 32C are laid.

In this case, the interval Pc and the width Qc of the uneven portion 32C are equal to the interval Pa of the uneven portion 32A (see FIG. 3).
And a value smaller than the width Qa. Also,
The activation condition determining unit 10 operates the external input switch 18 to operate the unevenness portion 3 in front of the dozing warning area 31C.
The function can be arbitrarily switched so that the vibration frequency F unique to 2C can be determined.

As shown in FIG. 5, the uneven portion 32C having the specific interval Pc and the width Qc immediately before the dozing warning area 31C.
By laying, the activation condition determining means 10 can determine that the vehicle is traveling just before the dozing warning area 31C based on the vibration frequency F.

Therefore, by using the vibration frequency detecting function of the activation condition determining means 10, when the vehicle 30 approaches the dozing warning area 31C, the notifying means is driven in response to the determination signal Df, and the dozing warning area 31C is driven. The driver can be notified of the approaching state of the driver in advance.

It is to be noted that, not only in the drowsiness warning area 31C, but also in other different areas on the traveling path 31, if the interval and width of the concave and convex portions are set to different values in the same manner, the specific vibration frequency F detected Based on the difference, it is possible to reliably determine the difference between the regions existing in front of the vehicle 30.

Therefore, the starting condition determining means 10 in the vehicle-mounted DSRC device can determine the state of the traveling path 31 through which the vehicle 30 is passing from the vibration frequency F, and gives the driver a response to the difference in the passing area. On the other hand, various warnings can be notified, and the safety can be further improved.

[0110]

As described above, according to the first aspect of the present invention, in a DSRC vehicle-mounted device for performing short-range communication with an on-road unit installed on a traveling path of a vehicle, a vehicle-mounted DSRC device is supplied with power from a battery. A receiving circuit to be activated; a receiving circuit starting means for starting the receiving circuit; and a starting condition determining means for determining a starting condition of the receiving circuit starting means. The starting condition determining means detects vibration information of the vehicle. And a vibration information determining means for comparing the vibration information of the vehicle with a reference value, wherein the vibration information corresponds to the starting condition with respect to the reference value.
When a predetermined condition is satisfied, a determination signal for activating the receiving circuit is output to the receiving circuit activating means, so that the receiving circuit is automatically activated only when necessary to reduce the power consumption. There is an effect that a vessel can be obtained.

According to a second aspect of the present invention, in the first aspect, the vibration information is a vibration level, and the reference value corresponds to the vibration level under a predetermined traveling condition of the vehicle. Since the determination means outputs the determination signal when the vibration level is equal to or higher than the reference value, the DSRC in-vehicle device in which the receiving circuit is automatically activated only when necessary and power consumption is suppressed can be obtained. is there.

According to a third aspect of the present invention, in the first aspect, the vibration information is a vibration frequency, and the reference value corresponds to a vibration frequency band under a predetermined traveling condition of the vehicle. Since the condition determination means outputs the determination signal when the vibration frequency indicates the reference value, the receiving circuit is automatically activated only when necessary to reduce the power consumption.
There is an effect that an on-board SRC device can be obtained.

According to a fourth aspect of the present invention, in the first aspect, the vibration information is a vibration level and a vibration frequency, and the reference value is a first value corresponding to the vibration level under a predetermined traveling condition of the vehicle. And a second reference value corresponding to a vibration frequency band under a predetermined traveling condition of the vehicle, wherein the activation condition determination means indicates that the vibration level is equal to or higher than the first reference value and the vibration frequency is equal to or less than the first reference value. Since the determination signal is output when the reference value indicates 2, the receiving circuit is automatically activated only when necessary, so that an on-board DSRC device with reduced power consumption can be obtained.

According to a fifth aspect of the present invention, in the first aspect, the vibration information is a vibration level and a vibration frequency, and the reference value is a first value corresponding to the vibration level under a predetermined traveling condition of the vehicle. And a second reference value corresponding to a vibration frequency band in a predetermined traveling condition of the vehicle, wherein the activation condition determination means determines whether the vibration level is equal to or higher than the first reference value, or Output the determination signal when the signal indicates the second reference value, so that the DSRC automatically activates the receiving circuit only when necessary to reduce power consumption.
There is an effect that a vehicle-mounted device can be obtained.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the activation condition determining means includes a filter means for performing a filtering process on the vibration information. Since the subsequent vibration information is compared with the reference value, the DSRC automatically activates the receiving circuit only when necessary to reduce power consumption, and suppresses the influence of noise components to improve reliability. There is an effect that a vehicle-mounted device can be obtained.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the activation condition determining means includes an external input switch, and the reference value is set when the external input switch is operated. It is set variably in response to the operation signal output from the external input switch, so that the receiving circuit is automatically started only when necessary to reduce power consumption, and the starting conditions are independent of the vehicle. There is an effect that a DSRC in-vehicle device capable of optimizing the reference value for determination is obtained.

According to the eighth aspect of the present invention, in the seventh aspect, the reference value is switched and set in a plurality of stages by the operation signal, so that the receiving circuit is automatically activated only when necessary. Thus, there is an effect that a vehicle-mounted DSRC device can be obtained in which the power consumption can be suppressed and the reference value for determining the activation condition can be easily optimized regardless of the vehicle.

According to a ninth aspect of the present invention, in the seventh aspect, the reference value is updated and set based on vibration information detected when the external input switch is operated, so that the reference value is updated only when necessary. Thus, there is an effect that a vehicle-mounted DSRC device that can automatically activate the receiving circuit to suppress power consumption and optimize the reference value for determining the activation condition regardless of the vehicle.

According to a tenth aspect of the present invention, in any one of the first to ninth aspects, the starting condition determining means includes a vehicle speed sensor for detecting the vehicle speed of the vehicle, and the reference value is , Which is set variably according to the vehicle speed, so that the receiving circuit is automatically activated only when necessary to reduce power consumption, and the reference value for determining the activation condition regardless of the difference in the running state of the vehicle. There is an effect that a DSRC in-vehicle device capable of optimizing is obtained.

According to an eleventh aspect of the present invention, in any one of the first to tenth aspects, the starting condition determining means includes: a memory means for storing vibration information over a predetermined period; A communication end signal generating means for generating a communication end signal at the end of communication; and, in response to the communication end signal, reading out vibration information immediately before the start of communication with the on-road device from the memory means and calculating and setting a reference value. And the reference value setting means for storing the reference value, so that the receiving circuit is automatically activated only when necessary to suppress the power consumption, and the reference value for determining the activation condition regardless of the difference in the road condition. There is an effect that a DSRC in-vehicle device capable of optimizing is obtained.

According to a twelfth aspect of the present invention, a predetermined interval and a predetermined width laid in a predetermined area of a traveling path of a vehicle by using the vehicle-mounted DSRC device according to any one of the first to eleventh aspects. Since the starting condition determining means outputs the determination signal in response to a comparison result between the reference value and the vibration information corresponding to the uneven portion, a high-precision corresponding to the uneven portion is provided. Based on the vibration information, there is an effect that a DSRC device in which the receiving circuit is automatically activated only when necessary and power consumption is surely suppressed can be obtained.

According to the thirteenth aspect of the present invention, in the twelfth aspect, the uneven portion is provided immediately before the communication area for the on-road device communicating with the receiving circuit.
There is an effect that a DSRC device in which power consumption is suppressed by automatically starting a receiving circuit only when necessary while approaching a communication area is obtained.

According to a fourteenth aspect of the present invention, in the twelfth aspect or the thirteenth aspect, the uneven portion is provided immediately before the curved area of the traveling road, so that the receiving circuit can be automatically operated only when necessary. In addition, the DSRC apparatus can be activated to reduce power consumption and to determine in advance the approach state of the curve area.

According to the fifteenth aspect of the present invention, in the twelfth aspect or the thirteenth aspect, the uneven portion is provided immediately before the drowsiness warning area on the traveling road, so that the receiving circuit is automatically activated only when necessary. Thus, there is an effect that a DSRC device that can be activated in advance to suppress power consumption and determine the approach state of the dozing warning area in advance can be obtained.

According to the sixteenth aspect of the present invention, in any one of the twelfth aspect to the fifteenth aspect, the interval and the width of the uneven portion are set to different values according to different regions of the traveling road. Therefore, the DSRC can automatically start the receiving circuit only when necessary, suppress power consumption, and determine in advance the approaching state of an arbitrary predetermined area.
There is an effect that a vehicle-mounted device can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a vehicle-mounted DSRC device according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a DSRC vehicle-mounted device according to Embodiment 6 of the present invention.

FIG. 3 is a plan view showing a traveling path related to a DSRC device according to a seventh embodiment of the present invention.

FIG. 4 is a plan view showing a traveling path related to a DSRC device according to an eighth embodiment of the present invention.

FIG. 5 is a plan view showing a traveling path related to a DSRC device according to Embodiment 9 of the present invention.

FIG. 6 is a block diagram showing a conventional DSRC vehicle-mounted device and its peripheral configuration.

FIG. 7 is a block diagram showing another example of a conventional DSRC vehicle-mounted device together with peripheral components.

[Explanation of symbols]

1 DSRC on-board unit, 2 roadside unit, 3 receiving circuit, 4
Receiving circuit starting means, 6, 6A battery, 10 starting condition determining means, 11 vibration sensor, 12 vibration level detecting means (vibration information detecting means), 13, 16 reference value setting means, 14 vibration level determining means (vibration information determining means) ),
15 vibration frequency detecting means (vibration information detecting means), 17
Vibration frequency determination means (vibration information determination means), 18 external input switch, 19 vehicle speed sensor, 20 memory means, 21 communication end signal generation means, 30 vehicle, 31
Travel path, 31A communication area, 31B curve area, 31
C dozing warning area, 32A-32C irregularities, A vibration, B vibration level (vibration information), Bm, Fm Vibration information immediately before communication start, Cb, Cf reference value, Db, Df determination signal, E communication end signal, F Vibration frequency (vibration information), G operation signal, Pa to Pc, interval between uneven portions, Qa
~ Qc The width of the uneven part, Vs vehicle speed.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G08G 1/00-1/16 H04B 7/26

Claims (16)

(57) [Claims] 1. A vehicle-mounted DSRC device for performing short-range communication with a roadside device installed on a traveling path of a vehicle, a receiving circuit activated by power supply from a battery, and a starting circuit for activating the receiving circuit. Receiving circuit starting means, and starting condition determining means for determining a starting condition of the receiving circuit starting means, wherein the starting condition determining means comprises: vibration information detecting means for detecting vibration information of the vehicle; and Vibration information determining means for comparing the vibration information with a reference value, wherein the vibration information corresponds to the start condition with respect to the reference value.
An on- board DSRC device that outputs a determination signal for activating the receiving circuit to the receiving circuit activating means when the predetermined condition is satisfied. 2. The vibration information is a vibration level, the reference value corresponds to a vibration level of the vehicle under a predetermined traveling condition, and the activation condition determination unit determines that the vibration level is the reference value. 2. The on-board DSRC device according to claim 1, wherein the determination signal is output in the case of the above. 3. The vibration information is a vibration frequency, the reference value corresponds to a vibration frequency band under a predetermined traveling condition of the vehicle, and the starting condition determination unit determines that the vibration frequency is the reference frequency. The DSRC vehicle-mounted device according to claim 1, wherein the determination signal is output when the value indicates a value. 4. The vibration information includes a vibration level and a vibration frequency, and the reference value includes a first reference value corresponding to a vibration level of the vehicle under predetermined traveling conditions, and a predetermined reference value of the vehicle. A second reference value corresponding to the vibration frequency band of the above, wherein the activation condition determination means indicates that the vibration level is equal to or higher than the first reference value, and the vibration frequency indicates the second reference value. The DSRC vehicle-mounted device according to claim 1, wherein the determination signal is output in the case. 5. The vibration information is a vibration level and a vibration frequency, and the reference value is a first reference value corresponding to a vibration level of the vehicle under a predetermined traveling condition, and a predetermined reference value of the vehicle. A second reference value corresponding to the vibration frequency band of the above, wherein the activation condition determination means, when the vibration level is equal to or more than the first reference value, or when the vibration frequency is the second reference value The DSRC vehicle-mounted device according to claim 1, wherein the determination signal is output in the case of indicating. 6. The apparatus according to claim 1, wherein the activation condition determination unit includes a filter unit that performs a filtering process on the vibration information, and compares the vibration information after the filtering process with the reference value. Item 6. The vehicle-mounted DSRC device according to any one of items 5 to 5. 7. The method according to claim 6, wherein the activation condition determination unit includes an external input switch, and wherein the reference value is variably set in response to an operation signal output from the external input switch when the external input switch is operated. The vehicle-mounted DSRC device according to any one of claims 1 to 6, wherein: 8. The on-board DSRC device according to claim 7, wherein the reference value is switched and set in a plurality of stages by the operation signal. 9. The on-board DSRC device according to claim 7, wherein the reference value is updated and set based on vibration information detected when the external input switch is operated. 10. The vehicle according to claim 1, wherein the activation condition determination unit includes a vehicle speed sensor for detecting a vehicle speed of the vehicle, and wherein the reference value is variably set according to the vehicle speed. Item 10. An on-board DSRC device according to any one of items 9 to 9. 11. The start condition determining means includes: memory means for storing vibration information over a predetermined period; communication end signal generating means for generating a communication end signal when communication with the roadside machine is ended; In response, the apparatus further comprises: reference value setting means for reading the vibration information immediately before the start of communication with the roadside device from the memory means, calculating and setting the reference value, and storing the reference value. The vehicle-mounted DSRC device according to any one of claims 1 to 10. 12. The vehicle according to claim 1, further comprising a plurality of uneven portions having a predetermined interval and a predetermined width laid in a predetermined region of a traveling path of the vehicle; The DSRC device using the vehicle-mounted DSRC device according to any one of claims 1 to 11, wherein the determination signal is output in response to a result of the comparison. 13. The DSRC apparatus according to claim 12, wherein the concave / convex portion is provided immediately before a communication area for a roadside device communicating with the receiving circuit. 14. The DSRC device according to claim 12, wherein the uneven portion is provided immediately before a curve area of the traveling road. 15. The device according to claim 12, wherein the uneven portion is provided immediately before a drowsiness warning area on the travel path.
Or a DSRC device according to claim 13. 16. The DSRC apparatus according to claim 12, wherein an interval and a width of the concave and convex portions are set to different values according to different areas of the traveling path. .